[ L. semi; akin to Gr. &unr_;&unr_;&unr_;, Skr. sāmi-, AS. sām-, and prob. to E. same, from the division into two parts of the same size. Cf. Hemi-, Sandelend. ] A prefix signifying half, and sometimes partly or imperfectly;
☞ The prefix semi is joined to another word either with the hyphen or without it. In this book the hyphen is omitted except before a capital letter; as, semiacid, semiaquatic, semi-Arian, semiaxis, semicalcareous. [ 1913 Webster ]
a. Slightly acid; subacid. [ 1913 Webster ]
a. Half acidified. [ 1913 Webster ]
a. Adherent part way. [ 1913 Webster ]
a. (Bot.) Partially amplexicaul; embracing the stem half round, as a leaf. [ 1913 Webster ]
n. (Geom.) The half of a given, or measuring, angle. [ 1913 Webster ]
a. Half-yearly. [ 1913 Webster ]
adv. Every half year. [ 1913 Webster ]
a. Having the figure of a half circle; forming a semicircle. Grew. [ 1913 Webster ]
n. [ See Arian. ] (Eccl. Hist.) A member of a branch of the Arians which did not acknowledge the Son to be consubstantial with the Father, that is, of the same substance, but admitted him to be of a like substance with the Father, not by nature, but by a peculiar privilege. [ 1913 Webster ]